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Species · Iowa · BBS 2026 Release · 1966–2025

Eastern Wood-Pewee Population Trend in Iowa

All statesAerial insectivores

Eastern Wood-Pewee in Iowa has risen sharply: up 55% on the route-weighted index since 1969.

+55%Since 1969TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
39Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Eastern Wood-Pewee Trends in IowaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Eastern Wood-Pewee has risen sharply in Iowa: up 55% on the route-weighted index since 1969.

Eastern Wood-Pewee Population Forecast in Iowa

If the recent trend holds, Eastern Wood-Pewee in Iowa is projected to fall about 43% by 2030 — from 2.5 in 2025 to a central estimate of 1.5 (95% range 0.75–2.2). A 5-year backtest shows a typical error of ±25.4%, with 80% of held-out values landing inside the 95% band.

-43%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
1.5Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.75–2.295% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±25.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Eastern Wood-Pewee in Iowa is projected to fall about 43% by 2030 — from 2.5 in 2025 to a central estimate of 1.5 (95% range 0.75–2.2). A 5-year backtest shows a typical error of ±25.4%, with 80% of held-out values landing inside the 95% band.19672030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20261.40.732.1
20271.40.732.1
20281.40.742.1
20291.40.752.2
20301.50.752.2

Eastern Wood-Pewee Survey Routes in Iowa

Routes recording Eastern Wood-Pewee in Iowa.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Festina920251968
Red Rock820251969
Mt Hamill720251967
Exline620251974
Alice619991967
Pierson620251968
Panther520251967
Hudson520251967
Bedford320251968
West Liberty320251968
Wales320251967
Dinsdale320251970
Kanawha320251976
Clare320191967
Washta320251967
Bryant220241971
Cedar Valley219971967
Desmoines219741968
Washington220251967
Titonka220251968
Rock Valley220181972
College Spgs 2220232007
Tipton220251993
Lafayette220252003
Mccallsburg220251996

Eastern Wood-Pewee Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.